Abstract: A fuel cell includes: an electrolyte membrane-electrode structure in which electrodes are provided on both surfaces of an electrolyte membrane and a frame member is joined to the outer peripheral portion of the electrolyte membrane; and a pair of separators for sandwiching the electrolyte membrane-electrode structure, wherein an overlapping portion of the outer peripheral portion of the electrode and the inner peripheral portion of the frame member is disposed in a flow field section in which flow field grooves for allowing a reactant gas to flow along the electrode surface of the electrolyte membrane-electrode structure are formed, and is disposed so as not to extend into buffers between the flow field section and passages.

Abstract: A power generation cell includes a resin-framed electrolyte membrane electrode assembly. The cathode of the resin-framed membrane electrode assembly has a larger surface dimension than the anode. An outer peripheral portion of the anode is positioned between a first buffer and a fuel gas flow field. An outer peripheral portion of the cathode is positioned between the resin frame member and the second buffer.

Abstract: In a resin frame equipped MEA, an electrolyte membrane has an outer peripheral overlapping portion that overlaps with an inner peripheral portion of a resin frame member. An ion flow blocking member is provided on the outer peripheral overlapping portion. The ion flow blocking member blocks the flow of iron ions, copper ions, or the like. The ion flow blocking member is formed in an annular shape, and surrounds an electrical power generating region of the MEA. The ion flow blocking member can be provided in the form of a physical barrier or a chemical barrier.

Abstract: A power generation cell includes a resin-framed electrolyte membrane electrode assembly. The cathode of the resin-framed membrane electrode assembly has a larger surface dimension than the anode. An outer peripheral portion of the anode is positioned between a first buffer and a fuel gas flow field. An outer peripheral portion of the cathode is positioned between the resin frame member and the second buffer.

Abstract: A method of selecting a thermoplastic-resin adhesive provided so as to be exposed to a fluid flow path of a power generation cell includes a load application step, an exposing step, a measurement step, and a selecting step. In the load application step, a compressive load is applied to a laminate body in a laminating direction thereof, the laminate body being formed by sandwiching an adhesive between a first resin film and a second resin film. In the exposing step, the laminate body is exposed to an environment heated to a predetermined temperature and humidified to a predetermined humidity. In the measurement step, a flow amount of the adhesive during the exposing step is measured. In the selecting step, the adhesive having the flow amount equal to or less than a predetermined amount is selected as an adhesive used for the power generation cell.

Abstract: A fuel cell includes: an electrolyte membrane-electrode structure in which electrodes are provided on both surfaces of an electrolyte membrane and a frame member is joined to the outer peripheral portion of the electrolyte membrane; and a pair of separators for sandwiching the electrolyte membrane-electrode structure, wherein an overlapping portion of the outer peripheral portion of the electrode and the inner peripheral portion of the frame member is disposed in a flow field section in which flow field grooves for allowing a reactant gas to flow along the electrode surface of the electrolyte membrane-electrode structure are formed, and is disposed so as not to extend into buffers between the flow field section and passages.

Abstract: A resin film equipped MEA of a power generation cell includes a membrane electrode assembly and a resin film. An inner peripheral end of a first frame shaped sheet of the resin film is positioned outside an outer peripheral end of a cathode, and faces the outer peripheral end of the cathode so as to be separated by a gap. An inner peripheral portion of a second frame shaped sheet is held between the anode and the cathode. A first metal separator facing the first frame shaped sheet is provided with protruding support structure configured to support an inner peripheral portion of the first frame shaped sheet and an outer peripheral portion of the cathode.

Abstract: An electrically insulating resin frame is provided on an outer peripheral side of a power generation section of a membrane electrode assembly forming a fuel cell of a fuel cell stack. A seal bead protruding toward the resin frame is formed on a metal separator. A metal sheet is provided in a portion of the resin frame overlapped with the seal bead as viewed in the stacking direction.

Abstract: A frame equipped membrane electrode assembly includes a membrane electrode assembly and a frame member. The frame member includes a first frame shaped sheet and a second frame shaped sheet. An inner peripheral portion of the first frame shaped sheet is joined to an outer peripheral portion of the membrane electrode assembly. The inner peripheral portion of the first frame shaped sheet is positioned between an outer peripheral portion of an anode and an outer peripheral portion of a cathode. An inner end of the second frame shaped sheet is positioned outside an outer end of the anode over the entire periphery. The outer end of the cathode is positioned outside the inner end of the second frame shaped sheet over the entire periphery.

Abstract: A fuel cell stack includes a stack body having a plurality of power generation cells that are stacked together, a pair of end plates, a case, and a coupling bar provided on a lateral side of the stack body, between a pair of end plates for coupling the end plates together. Positioning structure is provided in an inner surface of the case and the coupling bar, for defining positions of the inner surface and the coupling bar with respect to each other. The coupling bar includes an engaging part which engages with engaged parts formed in the stack body, respectively, and an insulating resin layer provided on a side of the coupling bar including the engaging part closer to the stack body.

Abstract: A resin film equipped MEA of a power generation cell includes a membrane electrode assembly and a resin film. An inner peripheral end of a first frame shaped sheet of the resin film is positioned outside an outer peripheral end of a cathode, and faces the outer peripheral end of the cathode so as to be separated by a gap. An inner peripheral portion of a second frame shaped sheet is held between the anode and the cathode. A first metal separator facing the first frame shaped sheet is provided with protruding support structure configured to support an inner peripheral portion of the first frame shaped sheet and an outer peripheral portion of the cathode.

Abstract: A frame equipped membrane electrode assembly includes a membrane electrode assembly and a frame member. The frame member includes a first frame shaped sheet and a second frame shaped sheet. An inner peripheral portion of the first frame shaped sheet is joined to an outer peripheral portion of the membrane electrode assembly. The inner peripheral portion of the first frame shaped sheet is positioned between an outer peripheral portion of an anode and an outer peripheral portion of a cathode. An inner end of the second frame shaped sheet is positioned outside an outer end of the anode over the entire periphery. The outer end of the cathode is positioned outside the inner end of the second frame shaped sheet over the entire periphery.